Similar happened to me but it had more to do with nectar flow stopping in my area enough for the bees to begin starving. Fortunately I caught it quick and gave them sugar syrup until the next flow had started. They were new colonies that were filling their comb with brood and not much reserves in food.

Logged

Check out West Coast Beekeepers on FB. A great place for Beekeepers along the west coast of America. All are welcome.

Pesticides or Starving did you look inside the hive ??? About is time of year New England get a dearth and you may see a lot of starving.

BEE HAPPY Jim 134 :)

Logged

"Tell me and I'll forget,show me and I may remember,involve me and I'll understand" Chinese Proverb

"The farmer is the only man in our economy who buys everything at retail, sells everything at wholesale, and pays the freight both ways." John F. KennedyFranklin County Beekeepers Association MA. http://www.franklinmabeekeepers.org/

Sweet corn seed has all kinds of nasty stuff on it so when the plant grows it will not have to be sprayed. The dust kicked up during the planting can move it on other plants that the bees are foraging on. The dew that the leaves hold and some bees drink from will get them also. As Finski said the damage should have run its coarse and what is lost should be slowing or over.